The wires can be used for everything from headphones to phone chargers, and have potential uses in electronic textiles.

To make the wires, researchers start with a thin tube made of an extremely elastic polymer and then fill the tube with a liquid metal alloy of gallium and indium, which is an efficient conductor of electricity.

“Previous efforts to create stretchable wires focused on embedding metals or other electrical conductors in elastic polymers; … increasing the amount of metal improves the conductivity of the composite, but diminishes its elasticity,” says Dr. Michael Dickey, an assistant professor of chemical and biomolecular engineering at NC State and co-author of a paper on the research.

“Our approach keeps the materials separate, so you have maximum conductivity without impairing elasticity. In short, our wires are orders of magnitude more stretchable than the most conductive wires, and at least an order of magnitude more conductive than the most stretchable wires currently in the literature.”

The research was funded by a National Science Foundation (NSF) CAREER award and the NSF’s Research Triangle Materials Research Science & Engineering Center.

Comments (5)

you reference filling the “tube with liquid metal alloy”. does the metal subsequently solidify and strech? at what temperature does the conductor return to a liquid state? roy eddleman rte417@gmail.com

Despite Gordon’s misgivings, the potential beyond the application shown is huge. I wonder which garment makers will be the first to embed stretchable wires and sensors into their clothing? Nike? Lululemon?

The stretching seen in the video was impressive. But when your kids see this, they will keep pulling it out across the room until they find a way to snap the wire. Kids have always got to test things to destruction.